Posted by **Sara** on Monday, January 23, 2012 at 4:17pm.

The physician has prescribed a medication of 3.5 mg/kg of body weight. If you give 297 mg of medication what is body weight of patient in kg? Is there a converstion formula?

- chemistry -
**DrBob222**, Monday, January 23, 2012 at 4:30pm
I don't know that there is but you can make one.

3.5 mg/kg x # kg = 297 mg.

Solve for # kg.

- chemistry -
**Sara**, Monday, January 23, 2012 at 4:52pm
Tell me what you think: I wrote

#kg = 297mg / 3.5 mg/kg the mg's would eliminate each other and you are left with 297 / 3.5 kg = 85 kg.

- chemistry -
**DrBob222**, Monday, January 23, 2012 at 5:17pm
Your answer is correct; however, you haven't made a new formula. You've just solved the equation I gave you.

- chemistry -
**Sara**, Monday, January 23, 2012 at 5:33pm
that is very true. What I was asking involves something like this as an example:

30mg/kg*1000g / 1kg* 1g /1000mg

30-/kg* 1000-/1-* 1g/1000-

30 * 1000/1000 * 1g = 30g

- chemistry -
**DrBob222**, Monday, January 23, 2012 at 8:00pm
You might be thinking of something like this in dimensional analysis. The factor is 3.5 mg/kg (or 1 kg/3.5 mg).

297 x (1 kg/3.5 mg) = 297/3.5 = 85 kg.

- chemistry -
**Sara**, Tuesday, January 24, 2012 at 9:09am
Thanks, That's it!

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